SpeedSpeak2Me

I picked up the Laird BB4503 for use with a mag mount and RG-8X. Out of the box it is tuned right about 452-453 MHz (using a Rig Expert Stick Pro). They give you exact trimming lengths to use, spaced at 5 MHz intervals (450, 455, 460, 465, 470 MHz). I'm within 1/8" from their 465 MHz measurement and have a nice flat curve throughout the entire GMRS band, IIRC about 1.2:1. I wouldn't have any issues picking up another one, and just might. The Midland MXTA26 is an exceptional antenna as well if you have the room for it. Another option is the Browning BR-450 UHF, which also requires trimming and is a tall antenna. Those that I've spoken to that own them have been very happy with their quality and performance.

I'm have the exact same issue. I have both the UT-72 and the UT-72G, and the 72G's UHF tuning appears to be in the 70cm band (centered on 440 MHz). With a Surecom SW-102 it's pretty much flat for 2m and MURS, about 1.1:1 for 70cm, almost 1.5:1 for GMRS simplex (462 MHz), and well over 2.1:1 on the repeater inputs (467 MHz). Using a NanoVNA (calibrated 400-500 MHz using 401 data points) it is showing the same. The "plain" UT-72 has better readings using both the meter and analyzer on the 462-467 MHz range than the UT-72G does, and it's quite disappointing, and somewhat frustrating. I know others that have the UT-72G and they're tuned for center of the GMRS band, right around 464 MHz, and are less than 1.25:1 across the band. Both came antennas came in identical bags, which do appear to be authentic Nagoya. The UT-72G bag has a second sticker/label covering the original. So UT-72 underneath, UT-72G on top. They are basically identical expect the UT-72G's mast/whip is about 1" shorter than the UT-72's, which is about right for tuning up a 70cm antenna for 64cm, and for bringing a 2m antenna up to MURS. Unfortunately neither are adjustable, unless you pull the rubberized protective cap off the whip and trim it back, then use something else to protect the end. When testing with the Surecom I used a double-male PL-259 connector so that the transceiver was directly connected to the meter, and took out any possibility of the jumper cable being an issue. Conversely I have a Diamond MR-77 that was tuned at > 1.3:1 for 2m and 70cm (center band for both) right out of the box. Since it was an extra antenna, and tunable, I trimmed off about 20mm, and it is now centered at 464.500 MHz, right in the middle of the GMRS range. I'm not worried about it on the VHF side, since it'll never be used for it. But 2m is still workable, with the NanoVNA showing it to be centered at 147.500 MHz (upper end of the band), at about 1.2:1 with a nice shallow dip covering a bandwidth of 10-12 MHz.